(a) Instruments executed by a corporation conveying an interest in real property, when signed by the president or vice-president and attested or countersigned by the secretary or an assistant secretary or the cashier or assistant cashier of the corporation, shall be conclusive evidence that the president or vice-president of the corporation executing the document does in fact occupy the official position indicated; that the signature of such officer subscribed thereto is genuine; and that the execution of the document on behalf of the corporation has been duly authorized. Any corporation may by proper resolution authorize the execution of such instruments by other officers of the corporation.

(b) Instruments executed by a corporation releasing a security agreement, when signed by one officer of the corporation or by an individual designated by the officers of the corporation by proper resolution, without the necessity of the corporation's seal being attached, shall be conclusive evidence that said officer signing is duly authorized to execute and deliver the same.